Uh yeah.. who's your coach? You should know this
Knight+Bishop checkmate!?

Uh yeah.. who's your coach? You should know this
lol i dont have any coach.if i had coach i wouldnt ask this to you!

It's a fun technique to practice with and can actually show up in your games. The knight is the especially tricky part but a little calculation should show when to control squares near the bishop's influence to wall off the king. Then when the king can only shuffle back and force between only two squares just move the knight around until the king is on a desirable square to deliver mate with.

i guess there is not any way to mate in otherside becasue black king can scape from c8 if white move his knight or it will be stalemate:

You can checkmate on the wrong corner, it's just not forced.
yeah but opponent should be silly to let this and dont scape from c7 or b8
mate with N+B is easy but need to practice

True. Like it's possible to checkmate with 2N+K vs K.
i didnt ask if it,s possible or not.for sure it,s possible but just in 2 corners

i guess there is not any way to mate in otherside becasue black king can scape from c8 if white move his knight or it will be stalemate:
In this position it is best to get the black king to the a1 corner:

Try http://www.youtube.com/watch?v=hKwrez7i7fo but it can,t be done in that corner, only where the bishop matches the corner.

Mate is forced. Bring the king to the edge, then start forcing it towards the right corner.
There is only one maneuver that's difficult - it looks like the king is about to escape but you box him in with the light pieces. Learn this one, and the rest is easy:
what after 6.Kc8???

QuantumKnight shows the key maneuver - the one that screws up most of the players who try and figure it out over the board, including some masters.
It can be a useful exercise with a study partner to take turns defending it. But as far as how much time to spend learning it, once you understand the trick of using the Knight & Bishop to create a barrier to corral the King, that's what you need. You will find far more of your games come down to Rook endings, and time devoted to learning those will translate into many more points in practice.
yeah rook end games happen more than these end games but i want learn this too
it is possible to checkmate in part of the board bishop support f8 or c1:
but is that possible to checkmate in otherside of the board that bishop cant support f or c file and just can support b8 or h2?????